Synonyms and related words :
absonant, contradictory, contrary to reason, fallacious, faulty, flawed, illogical, inauthentic, inconclusive, incongruous, inconsequent, inconsequential, inconsistent, invalid, irrational, loose, nonscientific, not following, paralogical, reasonless, self-annulling, self-contradictory, self-refuting, senseless, unauthentic, unconnected, unphilosophical, unreasonable, without reason